<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
     // 输入：'abc123'
     // 输出：true
      function containsNumber(str) {
        for (let i = 0; i < 10; i++) {
          if (str.indexOf(i) !== -1) return true;
        }
        return false;
      }
      console.log(containsNumber("abc123"));
    </script>
  </body>
</html>
